Distance holder with helical slot
a technology of distance holders and slots, applied in the field of distance holders, can solve the problem of further reducing the rotational speed, and achieve the effect of better extraction of steel abrasive particles
Inactive Publication Date: 2012-09-04
SHELL OIL CO
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Benefits of technology
The invention is a distance holder for a magnetic separator used in industrial applications. The holder has a slot that allows for better extraction of steel abrasive particles. The slot is connected to the housing and allows for a different flow path for the particles, which reduces the rotational speed and velocity of the particles. This improves the extraction effect of the magnetic separator. The slot can be provided in the housing skirt or in a deflector positioned between the skirt and the slot. The orientation of the deflector is important, and its size should match the width of the abrasive fluid jet. The technical effects of the invention are improved extraction of steel abrasive particles and reduced rotational speed and velocity of the particles.
Problems solved by technology
Thereby, the rotating steel abrasive particles will be subjected for a longer time period to the decelerating drag effect of the fluid, which further reduces the rotational speed thereof.
Method used
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[0020]The earth drilling device 2 as shown in FIGS. 1 and 2 is accommodated in a borehole 4 in an earth formation 5 and comprises a distance holder 1 and a drill string (not shown), which together are rotatable about an axis of rotation 3. Drill string 2 is suspended from a drilling rig at the surface of the earth formation 5, and comprises a pressure conduit 6 by means of which a drilling fluid is supplied to a jet nozzle 10, which is visible in the partially broken away view of FIG. 1. The drilling device furthermore comprises a magnetic separator 9 which consists of a magnet 7 contained in a magnet housing 8.
[0021]Steel abrasive particles 11 are extracted from the drilling fluid at the level of the magnetic separator 9. Under the influence of the magnetic field of magnet 7 of magnetic separator 9, the steel abrasive particles are attracted onto the surface of magnet housing 8. As a result of the shape of magnet housing 8, which tapers towards inlet 12 of jet nozzle 10, and the pa...
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A distance holder for connection to, and rotation with, a drill string in an earth formation drilling device arranged to supply a jet of abrasive fluid for the purpose of providing a borehole by removing earth formation material through abrasion, comprises a housing with a chamber which is essentially rotational symmetric and which is to face the earth formation material, and a jet nozzle which arranged for discharging a jet of the abrasive fluid in the chamber, the housing comprising at least one slot for allowing the abrasive fluid to leave the chamber. The slot is continued over the housing outer surface so as to counteract rolling motions of the particles which are comprised in the abrasive fluid.
Description
PRIORITY CLAIM[0001]The present application claims priority from PCT / EP2008 / 053341, filed 20 Mar. 2008, which claims priority from EP Application 07104677.5, filed 22 Mar. 2007.BACKGROUND OF THE INVENTION[0002]The invention is related to a distance holder for connection to, and rotation with, a drill string in an earth formation drilling device arranged to supply a jet of abrasive fluid for the purpose of providing a borehole by removing earth formation material through abrasion, comprising a housing with a chamber which is essentially rotational symmetric and which is to face the earth formation material, and a jet nozzle which arranged for discharging a jet of the abrasive fluid in said chamber, said housing comprising at least one slot for allowing the abrasive fluid to leave the chamber.[0003]Such a distance holder is disclosed in WO-A-2005 / 040546. By means of an earth formation drilling device which is equipped with a distance holder of this type, the borehole bottom is abraded...
Claims
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IPC IPC(8): E21B7/16
CPCE21B21/002E21B7/18
Inventor BLANGE, JAN-JETTE
Owner SHELL OIL CO